Fatal error: Uncaught Error: Interface "Symfony\Component\VarDumper\Cloner\ClonerInterface" not found in /users/energydata/www/volkszaehler.org/vendor/symfony/var-dumper/Cloner/AbstractCloner.php:22 Stack trace: #0 {main} thrown in /users/energydata/www/volkszaehler.org/vendor/symfony/var-dumper/Cloner/AbstractCloner.php on line 22